Horizontal Stiffness

This article relates to ISO 16840-2:2018, Annex C

Graphic provided by the University of Pittsburgh Wheelchair and Cushion Standards Group

  Learn more about Horizontal Stiffness:

Video

Horizontal Stiffness Overview

Sample Data

Horizontal Stiffness (wheelchairstandards.com)

Other physical and mechanical characteristics of seat cushions

Make sure to learn about the following physical and mechanical characteristics of seat cushions intended to manage tissue integrity:

• Impact Damping
• Loaded Contour Depth and Overload Deflection (LCD)
• Hysteresis

Related Literature

International Organization for Standardization. ISO 16840-2: Wheelchair seating — Part 2: Determination of physical and mechanical characteristics of devices intended to manage tissue integrity – Seat cushions. Geneva, Switzerland; 2018.

Akins JS, Karg PE, Brienza DM. Interface shear and pressure characteristics of wheelchair seat cushions. J Rehabil Res Dev 2011; 48:225–34. https://doi.org/10.1682/jrrd.2009.09.0145.

Wheelchair & Cushion Performance Testing Standards – Guidance on interpretation of performance standards for wheelchair seat cushions. https://www.wheelchairstandards.pitt.edu/sites/default/files/fact-sheets/cpig_tabular.pdf.

Wheelchair & Cushion Performance Testing Standards – Interpreting wheelchair seat cushion performance standards.  https://www.wheelchairstandards.pitt.edu/sites/default/files/fact-sheets/cpig_with_pictures.pdf.

Acknowledgements

We would like to thank the University of Pittsburgh Wheelchair and Cushion Standards Group for the contribution on this topic.